/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 *****************************************************************************/

#ifdef SPINE_UE4
    #include "SpinePluginPrivatePCH.h"
#endif

#include <spine/TwoColorTimeline.h>

#include <spine/Event.h>
#include <spine/Skeleton.h>

#include <spine/Animation.h>
#include <spine/Bone.h>
#include <spine/Slot.h>
#include <spine/SlotData.h>
#include <spine/TimelineType.h>

using namespace spine;

RTTI_IMPL(TwoColorTimeline, CurveTimeline)

const int TwoColorTimeline::ENTRIES = 8;
const int TwoColorTimeline::PREV_TIME = -8;
const int TwoColorTimeline::PREV_R = -7;
const int TwoColorTimeline::PREV_G = -6;
const int TwoColorTimeline::PREV_B = -5;
const int TwoColorTimeline::PREV_A = -4;
const int TwoColorTimeline::PREV_R2 = -3;
const int TwoColorTimeline::PREV_G2 = -2;
const int TwoColorTimeline::PREV_B2 = -1;
const int TwoColorTimeline::R = 1;
const int TwoColorTimeline::G = 2;
const int TwoColorTimeline::B = 3;
const int TwoColorTimeline::A = 4;
const int TwoColorTimeline::R2 = 5;
const int TwoColorTimeline::G2 = 6;
const int TwoColorTimeline::B2 = 7;

TwoColorTimeline::TwoColorTimeline(int frameCount) : CurveTimeline(frameCount), _slotIndex(0) {
    _frames.ensureCapacity(frameCount * ENTRIES);
    _frames.setSize(frameCount * ENTRIES, 0);
}

void TwoColorTimeline::apply(Skeleton &skeleton, float lastTime, float time, Vector<Event *> *pEvents, float alpha,
                             MixBlend blend, MixDirection direction) {
    SP_UNUSED(lastTime);
    SP_UNUSED(pEvents);
    SP_UNUSED(direction);

    Slot *slotP = skeleton._slots[_slotIndex];
    Slot &slot = *slotP;
    if (!slot._bone.isActive()) return;

    if (time < _frames[0]) {
        // Time is before first frame.
        switch (blend) {
            case MixBlend_Setup:
                slot.getColor().set(slot.getData().getColor());
                slot.getDarkColor().set(slot.getData().getDarkColor());
                return;
            case MixBlend_First: {
                Color &color = slot.getColor();
                color.r += (color.r - slot._data.getColor().r) * alpha;
                color.g += (color.g - slot._data.getColor().g) * alpha;
                color.b += (color.b - slot._data.getColor().b) * alpha;
                color.a += (color.a - slot._data.getColor().a) * alpha;

                Color &darkColor = slot.getDarkColor();
                darkColor.r += (darkColor.r - slot._data.getDarkColor().r) * alpha;
                darkColor.g += (darkColor.g - slot._data.getDarkColor().g) * alpha;
                darkColor.b += (darkColor.b - slot._data.getDarkColor().b) * alpha;
                return;
            }
            default:
                return;
        }
    }

    float r, g, b, a, r2, g2, b2;
    if (time >= _frames[_frames.size() - ENTRIES]) {
        // Time is after last frame.
        size_t i = _frames.size();
        r = _frames[i + PREV_R];
        g = _frames[i + PREV_G];
        b = _frames[i + PREV_B];
        a = _frames[i + PREV_A];
        r2 = _frames[i + PREV_R2];
        g2 = _frames[i + PREV_G2];
        b2 = _frames[i + PREV_B2];
    } else {
        // Interpolate between the previous frame and the current frame.
        size_t frame = (size_t)Animation::binarySearch(_frames, time, ENTRIES);
        r = _frames[frame + PREV_R];
        g = _frames[frame + PREV_G];
        b = _frames[frame + PREV_B];
        a = _frames[frame + PREV_A];
        r2 = _frames[frame + PREV_R2];
        g2 = _frames[frame + PREV_G2];
        b2 = _frames[frame + PREV_B2];
        float frameTime = _frames[frame];
        float percent = getCurvePercent(frame / ENTRIES - 1,
                                        1 - (time - frameTime) / (_frames[frame + PREV_TIME] - frameTime));

        r += (_frames[frame + R] - r) * percent;
        g += (_frames[frame + G] - g) * percent;
        b += (_frames[frame + B] - b) * percent;
        a += (_frames[frame + A] - a) * percent;
        r2 += (_frames[frame + R2] - r2) * percent;
        g2 += (_frames[frame + G2] - g2) * percent;
        b2 += (_frames[frame + B2] - b2) * percent;
    }

    if (alpha == 1) {
        Color &color = slot.getColor();
        color.set(r, g, b, a);

        Color &darkColor = slot.getDarkColor();
        darkColor.set(r2, g2, b2, 1);
    } else {
        Color &light = slot._color;
        Color &dark = slot._darkColor;
        if (blend == MixBlend_Setup) {
            light.set(slot._data._color);
            dark.set(slot._data._darkColor);
        }
        light.add((r - light.r) * alpha, (g - light.g) * alpha, (b - light.b) * alpha, (a - light.a) * alpha);
        dark.add((r2 - dark.r) * alpha, (g2 - dark.g) * alpha, (b2 - dark.b) * alpha, 0);
    }
}

int TwoColorTimeline::getPropertyId() {
    return ((int)TimelineType_TwoColor << 24) + _slotIndex;
}

void TwoColorTimeline::setFrame(int frameIndex, float time, float r, float g, float b, float a, float r2, float g2, float b2) {
    frameIndex *= ENTRIES;
    _frames[frameIndex] = time;
    _frames[frameIndex + R] = r;
    _frames[frameIndex + G] = g;
    _frames[frameIndex + B] = b;
    _frames[frameIndex + A] = a;
    _frames[frameIndex + R2] = r2;
    _frames[frameIndex + G2] = g2;
    _frames[frameIndex + B2] = b2;
}

int TwoColorTimeline::getSlotIndex() {
    return _slotIndex;
}

void TwoColorTimeline::setSlotIndex(int inValue) {
    assert(inValue >= 0);
    _slotIndex = inValue;
}
